------------------------------------------------------------------------------ README ------------------------------------------------------------------------------ This example demonstrates the ease of setting up the UART with libopencm3, and using UART interrupts. UART echo is achieved by echoing back received characters from within the interrupt service routine. This has the advantage over using blocking reads and writes that the main program loop is freed for other tasks. The UART is set up as 921600-8N1. PA0 is the Rx pin, and PA1 is the Tx pin (from the LM4F perspective). These pins are connected to the CDCACM interface on the debug chip, so no hardware is necessary to test this example. Just connect the debug USB cable and use a terminal program to open the ACM port with 921600-8N1. For example: $ picocom /dev/ttyACM0 -b921600